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  <h2 class="title">Stream Classes</h2>
  <p class="simpara">
   User designed wrappers can be registered via <span class="function"><strong>stream_wrapper_register()</strong></span>,
   using the class definition shown on that manual page.
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   Class <a href="class.php-user-filter.html" class="classname">php_user_filter</a> is predefined and is an abstract
   baseclass for use with user defined filters.  See the manual page for
   <span class="function"><a href="function.stream-filter-register.html" class="function">stream_filter_register()</a></span> for details on implementing
   user defined filters.
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